What is the religious ruling on using the photocopier available at the workplace to print religious lectures and articles, knowing that the papers being copied belong to me?

You are not permitted to use others' property without their permission, whether for personal or public benefit. Your use of the copier to print lectures and religious articles is a good deed, but it does not make it permissible for you to use another's right without their permission. Your ownership of the paper does not mean you own the ink, the printing machine, and its accessories. Therefore, you are not permitted to use the aforementioned work tools.